CN110253505B

CN110253505B - Fastener driving tool

Info

Publication number: CN110253505B
Application number: CN201910500049.6A
Authority: CN
Inventors: 常凤智; 高冬生; 朱清华; 王爱国
Original assignee: Nanjing Toua Hardware & Tools Co ltd
Current assignee: Nanjing Toua Hardware & Tools Co ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2022-03-15
Anticipated expiration: 2039-06-11
Also published as: CN110253505A

Abstract

The invention relates to a fastener driving tool, and belongs to the technical field of electric tools. The tool comprises an energy storage mechanism consisting of a cylinder body and a piston in a shell, wherein the piston is fixedly connected with a firing pin extending to a gun nozzle, one side of the cylinder body is provided with a grab handle with a battery pack, one side of the gun nozzle is provided with a nail box, and a lifting mechanism is arranged between the grab handle and the nail box; the lifting mechanism comprises a tooth-missing abdication driving wheel meshed with the firing pin, and the driving wheel is in transmission connection with a motor for providing electric energy for the battery pack; the striker has a set of engaging projections in the longitudinal direction, a first engaging projection of the striker adjacent to the piston is higher than the other engaging projections, and the first engaging tooth of the drive wheel corresponding to the first engaging projection is offset from the other engaging projections in the axial direction. After the invention is adopted, the normal meshing relationship between the driving wheel and the firing pin can be always ensured, the possible meshing interference between the driving wheel and the firing pin due to staple is effectively avoided, the out-of-control action of the firing pin is thoroughly avoided, and the operation safety is ensured.

Description

Fastener driving tool

Technical Field

The invention relates to a fastener driving tool, in particular to an electric air spring nail gun, and belongs to the technical field of electric tools.

Background

As far as the applicant is aware, tools for securing one object to another by means of nail-like fasteners have long been pneumatic-based, including high pressure gas, gas combustion, etc., and are not only expensive, but also present safety hazards. Therefore, in recent years, an electric gas spring nail gun has been proposed, and a typical structure thereof is disclosed in chinese patent application No. 201621041199.3, in which a motor drives a missing tooth abdicating drive wheel to rotate, thereby lifting a striker engaged therewith, and compressing air in a cylinder by a piston to store energy. And then, when the driving wheel reaches the tooth-missing yielding state and is disengaged from the striker, the compressed air enables the piston to drive the striker released by the driving wheel to move quickly, and the nailing action is finished. Thereafter, the drive wheel again enters the lifting engagement state and the next stapling cycle is performed. Because the energy comes from the electric energy, consequently control the performance good, it is comparatively safe.

However, in practice, it has been found that when such a nail gun is accidentally jammed during operation for various reasons, as shown in fig. 1 and 2, because the striker 4 is retarded and not moved to the normal limit position indicated by the chain line, the teeth of the driving wheel 9 may interfere with the striker 4 when being lifted again to engage the striker, i.e., be retarded and not enter the engagement state, and not only may the driving member be damaged due to the motor being in the retarded state, but also because the air in the air cylinder still has a certain pressure, the striker may run away once the jam is removed, thereby causing a safety hazard.

For this reason, the solution disclosed in US patent application No. US20180154505a1 attempts to solve the above-mentioned problem by providing a resilient engagement member on the drive wheel to avoid interference. However, the elastic engaging member having a certain degree of freedom is not only complicated in structure but also poor in reliability.

Disclosure of Invention

The invention aims to: aiming at the problems in the prior art, the fastener driving tool is simple and reliable in structure, and can effectively avoid out-of-control action of the firing pin due to clamping stagnation, so that convenience and safety in use are ensured.

In order to achieve the above object, one of the basic technical solutions of the fastener driving tool of the present invention is: the energy storage mechanism comprises a cylinder body and a piston in a shell, wherein the piston is fixedly connected with a firing pin extending to a gun nozzle, one side of the cylinder body is provided with a grab handle with a battery pack, one side of the gun nozzle is provided with a nail box, and a lifting mechanism is arranged between the grab handle and the nail box; the lifting mechanism comprises a tooth-missing abdication driving wheel meshed with the firing pin, and the driving wheel is in transmission connection with a motor for providing electric energy for the battery pack;

the length direction of the firing pin is provided with a group of engaging bulges, a first engaging bulge of the firing pin adjacent to the piston is higher than other engaging bulges, and the first engaging tooth of the driving wheel corresponding to the first engaging bulge deviates towards the axial direction of the driving wheel to leave the other engaging bulges.

When the staple is used, the first meshing tooth is mainly clamped by the second meshing protrusion when the driving wheel enters the lifting meshing state again, so that the normal meshing relation between the driving wheel and the firing pin can be always ensured after the technical scheme of the invention is adopted, the possible meshing interference of the driving wheel and the firing pin due to the staple is effectively avoided, the out-of-control action of the firing pin is thoroughly avoided, and the operation safety is ensured.

The further improvement of the basic technical scheme is as follows: two sides of the firing pin in the length direction are respectively provided with a group of engaging bulges, and the driving wheel is composed of coaxial tooth-lacking transmission wheels which are respectively and intermittently engaged with the engaging bulges at the two sides. Therefore, the synchronous transmission of the two symmetrical meshing pairs can be more stable and reliable.

The further improvement of the basic technical scheme is as follows: in the group of engaging protrusions, the engaging protrusion adjacent to the gun nozzle is circular in cross section, the sectional area is larger than that of other engaging protrusions, and the other engaging protrusions are rectangular in cross section. Therefore, the engaging bulge with the largest stress has ideal bearing capacity and is wear-resistant.

The second basic technical scheme of the fastener driving tool of the invention is as follows: the energy storage mechanism comprises a cylinder body and a piston in a shell, wherein the piston is fixedly connected with a firing pin extending to a gun nozzle, one side of the cylinder body is provided with a grab handle with a battery pack, one side of the gun nozzle is provided with a nail box, and a lifting mechanism is arranged between the grab handle and the nail box; the lifting mechanism comprises a tooth-missing abdication driving wheel meshed with the firing pin, and the driving wheel is in transmission connection with a motor for providing electric energy for the battery pack;

the length direction of the firing pin is provided with a first group of engaging bulges and a second group of engaging bulges which are respectively positioned at two sides, and the tooth-lacking abdicating driving wheel is provided with a coaxial first tooth-lacking driving wheel and a coaxial second tooth-lacking driving wheel which are respectively engaged with the first group of engaging bulges and the second group of engaging bulges; the first group of meshing bulges and the first group of tooth-lacking transmission wheels lack the first meshing bulges and the first meshing teeth respectively, and the second group of meshing bulges and the second group of tooth-lacking transmission wheels lack the second meshing bulges and the second meshing teeth respectively.

Therefore, the normal meshing relation between the driving wheel and the firing pin can still be ensured all the time by the two sets of meshing which are alternately meshed, and due to the fact that a reasonable missing structure is arranged, meshing interference possibly existing between the first meshing tooth and the second meshing protrusion due to the staple bolt can be effectively avoided, out-of-control action of the firing pin is thoroughly avoided, and operation safety is ensured.

Drawings

The invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a meshing interference structure in the prior art.

Fig. 2 is a schematic perspective view of fig. 1.

Fig. 3 is a schematic perspective view of a first embodiment of the present invention.

Fig. 4 is a schematic cross-sectional structure diagram of the embodiment of fig. 3.

Fig. 5 is a schematic perspective view of the lifting mechanism of the embodiment of fig. 3.

Fig. 6 is a perspective view of fig. 5 from another angle.

Fig. 7 is a schematic perspective view of a lifting mechanism according to a second embodiment of the present invention.

Detailed Description

Example one

The basic structure of the fastener driving tool of this embodiment is shown in fig. 3 and 4, and an energy storage mechanism 2 composed of a cylinder 2-2 and a piston 2-1 is mounted at the rear end of a housing 1, and the piston 2-1 is fixedly connected with a firing pin 4 extending to a gun nozzle 3. A grab handle 5 with a battery pack 5-1 is arranged at the lower side of the cylinder body 2-2, a nail box 6 for arranging the strip nails is arranged at the lower side of the gun nozzle 3, and a lifting mechanism 7 positioned at the upper part, a motor 8 positioned at the lower part and a speed reduction transmission mechanism 8-1 are arranged between the grab handle 5 and the nail box 6.

The lifting mechanism 7 is specifically structured as shown in fig. 5 and 6, and comprises a tooth-missing abdicating driving wheel 9 meshed with the striker 4, and the driving wheel 9 is in transmission connection with a motor 8 for supplying electric energy to the battery pack 5-1 through a speed reducing transmission mechanism 8-1.

The two sides of the firing pin 4 in the length direction are respectively provided with four groups of engaging bulges 4-1, 4-2, 4-3 and 4-4, wherein the first engaging bulge 4-1 of the firing pin 4 adjacent to the piston 2-1 is higher than the other engaging bulges 4-2, 4-3 and 4-4, the driving wheel 9 is composed of coaxial tooth-lacking driving wheels which are respectively and intermittently engaged with the engaging bulges at the two sides, and the tooth-lacking driving wheel is bent outwards along the axial direction of the driving wheel 9 corresponding to the first engaging tooth 9-1 of the first engaging bulge 4-1 to deviate so as to leave the other engaging bulges 4-2, 4-3 and 4-4. As shown by stress analysis and tests, the engaging protrusion 4-4 adjacent to the gun nozzle is stressed most in lifting transmission, so that the engaging protrusion is designed into a circular section with good bearing force and difficult abrasion, the sectional area is larger than other engaging protrusions, and the other engaging protrusions are designed into rectangular sections. 4-5 in the figures are extreme position sensing devices.

Therefore, the required normal lifting transmission and the required releasing nailing can be completed like the prior art, and in case of clamping nails, when the driving wheel enters the lifting meshing state again, because the first meshing teeth completely avoid the second meshing protrusions with the axially deviated reasonable structure, no matter where the second meshing protrusions are located, the interference retardation can not occur, the normal meshing relation between the driving wheel and the firing pin can be always ensured, the out-of-control action of the firing pin is thoroughly stopped, and the operation safety is ensured.

Example two

The basic construction of the fastener driving tool of this embodiment is the same as that of the first embodiment except that the lift mechanism has first and second sets of engaging projections on both sides in the longitudinal direction of the striker 4 as shown in fig. 7, and the toothless relief drive wheel 9 has coaxial first and second toothless drive wheels which engage with the first and second sets of engaging projections, respectively. The first set of meshing bulges and the first set of gear-lacking transmission wheels are respectively lack of the first meshing bulges and the first meshing teeth, namely only have the second, third and fourth meshing bulges 4-2, 4-3 and 4-4 except the first meshing bulges and only have the second, third and fourth meshing teeth 9-2, 9-3 and 9-4 except the first meshing teeth; and the second set of engaging projections and the second set of gear wheel without teeth lack the second engaging projections and the second engaging teeth respectively, namely only have the first, third and fourth engaging projections 4-1 ', 4-3' and 4-4 'except the second engaging projections, and only have the first, third and fourth engaging teeth 9-1', 9-3 'and 9-4' except the second engaging teeth.

During promotion meshing transmission under the normal condition, the first in turn of both sides meshing pair then synchronous meshing still can guarantee the normal meshing between drive wheel and the firing pin all the time, and in case the bail, when the drive wheel got into promotion meshing state again, because first set of meshing pair does not have first meshing tooth, consequently first meshing tooth can not take place and the bellied transmission of second meshing is interfered, and the second meshing pair does not have the second meshing arch this moment, consequently first meshing tooth can not take place yet and the bellied transmission of second meshing is interfered, thereby the out-of-control action of firing pin has been stopped, operation safety has been ensured.

Therefore, the interference root cause that the first meshing tooth is blocked by the second meshing protrusion when the driving wheel enters the lifting meshing state again after the staple is caught is ingeniously adopted, and the avoiding measures are ingeniously adopted, so that the phenomenon that the action of the firing pin is out of control due to the fact that the staple is locked is effectively avoided under the condition that a locking mechanism is not additionally arranged, reliable meshing transmission lifting motion is guaranteed, and potential safety hazards are eliminated.

In addition to the embodiments described above, the present invention may have other variations. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the present invention.

Claims

1. A fastener driving tool comprises an energy storage mechanism consisting of a cylinder body and a piston in a shell, wherein the piston is fixedly connected with a firing pin extending to a gun nozzle, one side of the cylinder body is provided with a grab handle with a battery pack, one side of the gun nozzle is provided with a nail box, and a lifting mechanism is arranged between the grab handle and the nail box; the hoist mechanism contains the missing tooth that meshes with the firing pin and lets a drive wheel, the drive wheel is connected with the motor transmission that the battery package provided the electric energy, its characterized in that:

the length direction of the firing pin is provided with a group of engaging bulges, a first engaging bulge of the firing pin adjacent to the piston is higher than other engaging bulges, and the first engaging teeth of the driving wheel corresponding to the first engaging bulge are deviated from the axial directions of other engaging bulges;

two sides of the firing pin in the length direction are respectively provided with a group of engaging bulges, and the driving wheel is composed of coaxial tooth-lacking transmission wheels which are respectively and intermittently engaged with the engaging bulges at the two sides.

2. The fastener driving tool as claimed in claim 1, wherein: in the group of engaging protrusions, the engaging protrusion adjacent to the gun nozzle is circular in cross section, the sectional area is larger than that of other engaging protrusions, and the other engaging protrusions are rectangular in cross section.

3. A fastener driving tool comprises an energy storage mechanism consisting of a cylinder body and a piston in a shell, wherein the piston is fixedly connected with a firing pin extending to a gun nozzle, one side of the cylinder body is provided with a grab handle with a battery pack, one side of the gun nozzle is provided with a nail box, and a lifting mechanism is arranged between the grab handle and the nail box; the hoist mechanism contains the missing tooth that meshes with the firing pin and lets a drive wheel, the drive wheel is connected with the motor transmission that the battery package provided the electric energy, its characterized in that:

4. The fastener driving tool as claimed in claim 3, wherein: in the first and second sets of engaging projections, the engaging projection adjacent to the muzzle is circular in cross section and larger in cross section area than the other engaging projections, and the other engaging projections are rectangular in cross section.